Foot brush



FIG. 1 is a perspective view of a “foot brush” showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dashed lines in the drawings represent a boundary between claimed and unclaimed areas, and form no part of the claimed design. 

The ornamental design for a “foot brush,” as shown and described. 